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INDOOR UNIT CONTROLS and COMPONENTS
PAGE 16
ENGLISH
Terminal Block
Display
Ambient Temperature Sensor
Coil Temperature Sensor
The terminal block receives electrical power from the
outdoor unit.Terminals 1 and 2 are connected to terminals
1 and 2 of the outdoor unit. This wiring supplies power to the
indoor unit.
Terminal 3 is a communication wire. The indoor unit sends
indoor air temperature, coil temperature and temperature
set point information to the outdoor unit on this wire. If a
splice or break in this wire is present, the indoor unit will not
be able to communicate with the outdoor unit. The ERROR
CODE will be E7.
The Ambient Sensor is a negative coefficient thermistor
that will decrease in resistance with increases in room air
temperature. The sensor is located on a clip mounted
to the surface of the indoor coil.
The sensor connects to the control board at Plug CN-6.
The indoor display is an infrared communication circuit that
receives operating commands from the remote control. This
display will indicate operating modes, error codes, indoor air
temperature, timer and power status. The Coil Sensor is a negative coefficient thermistor that
will decrease in resistance with increases in coil temperature.
The sensor is located in a socket soldered to the surface of
the indoor coil.
This sensor will monitor the temperature of the indoor coil
in both cooling and heating. Should abnormally cold or hot
coil temperature be detected by this sensor, the system
will take steps to correct the condition or report an error
code.
The sensor connects to the control board at Plug CN-6.
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